Additions to the lichen biota of Assam State, India

The present paper deals with 25 new records of lichens under 19 genera and 11 families for the state of Assam in India. The newly reported species from Assam are Alyxoria apomelaena, A. culmigena, A. varia, Caloplaca pseudisteroides, Cryptothecia striata, Diorygma rupicola, Dirinaria papillulifera, Flavoplaca citrina, Graphis sundarbanensis, Herpothallon echinatum, Lecanographa rufa, Letrouitia muralis, Myriotrema clandestinum, Opegrapha discolor, Parmotrema crinitoides, Phaeophyscia hispidula, Porina eminentior, P. interstes, P. mastoidella, Pyrenula submastophora, P. thelomorpha, Rinodina oxydata, Synarthonia bicolor, Zwackhia bonplandii, and Z. viridis. Brief descriptions of these additional lichen taxa from Assam are provided to facilitate their identification.